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TOPIC: second segment climb gradient FAR 25.121 - Clarification

second segment climb gradient FAR 25.121 - Clarification 11 years 7 months ago #14

  • nayak48c
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I am in process of applying for FAR 25 certification for a twin engine turbo prop transport aircraft. As per FAR 25.121 the aircraft need to demonstrate a steady climb gradient of 2.4%. However as per FAR 25.111 & 25.113, 25.115, the net climb gradient is the gross gradient reduced by 0.8% . Therefore I wish to know whether the aircraft is required to demonstrate 1.6 % (2.4%- 0.8% = 1.6%) of second segment climb gradient or 3.2 % (3.2% - 0.8% = 2.4%) of second segment climb gradient ?

Thanks in advance

clim gradient 11 years 3 months ago #65

  • alawless
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I realize you must have your answer by now, but the plane must fly 3.2% then you subtract the .8% to show compliance.

Al

clim gradient 2 months 2 weeks ago #985

  • karthik
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I was going through a flight manual of HS 748 (AVRO aircraft).
There were two graphs for second segment climb gradient :-
1 The WAT graph was giving an AUW for a particular Altitude and Temperature condition and
2 the Net takeoff flight path graph of second segment was giving various gradients for various weight, altitude and temperature conditions.
The AUW of WAT graph for a particular condition was giving only 1.6% gradient in the Second segment net takeoff flight path graph.
This puts a doubt in my mind as to WAT graph in the flight manual is supposed to give 2.4% gross or net performance.
Can you please elaborate on the subject with some documentary references.
Thanks

second segment climb gradient FAR 25.121 - Clarification 2 months 2 weeks ago #988

  • guygratton
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I doubt somewhat that the HS748 is a FAR-25 aeroplane. Check the TCDS for the approval basis, which I suspect will be the old BCAR Section D.

I'm on holiday and just using my phone at the moment, but if you need it and contact me direct next week, I have scans of a couple of editions of Section D and may be able to help you out with the reference.

G2

guy.gratton@cranfield.ac.uk

second segment climb gradient FAR 25.121 - Clarification 2 months 2 weeks ago #989

  • Babu
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Thank you,
I will contact next week
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